How severe is CVE-2015-7503?

CVE-2015-7503 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2015-7503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-7503?

CVE-2015-7503 primarily affects Zend Zend Framework. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-7503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2015-7503 published?

CVE-2015-7503 was published on 2017-10-10 and last updated on 2026-06-17.

CVE-2015-7503

CVE-2015-7503 is a high-severity vulnerability in Zend Zend Framework with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-320.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-320
Affected product: Zend Zend Framework
Published: 2017-10-10
Last modified: 2026-06-17

Description

Zend Framework before 2.4.9, zend-framework/zend-crypt 2.4.x before 2.4.9, and 2.5.x before 2.5.2 allows remote attackers to recover the RSA private key.

Frequently asked questions

What is CVE-2015-7503?: Zend Framework before 2.4.9, zend-framework/zend-crypt 2.4.x before 2.4.9, and 2.5.x before 2.5.2 allows remote attackers to recover the RSA private key.
How severe is CVE-2015-7503?: CVE-2015-7503 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2015-7503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-7503?: CVE-2015-7503 primarily affects Zend Zend Framework. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-7503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2015-7503 published?: CVE-2015-7503 was published on 2017-10-10 and last updated on 2026-06-17.

References

Affected products (11)

cpe:2.3:a:zend:zend_framework:2.4.0:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.4.1:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.4.2:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.4.3:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.4.4:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.4.5:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.4.6:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.4.7:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.4.8:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.5.0:*:*:*:*:*:*:*
cpe:2.3:a:zend:zend_framework:2.5.1:*:*:*:*:*:*:*

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